Jason Wu: Think a gust of chilly temps and freezing sleet will keep the sartorial set at bay? Not a chance. Fashionâ€™s upper echelon braved the climes (in five inch, heels no less) to pack into Jason Wuâ€™s Park Ave. show on Friday afternoon. â€œThe first thing I thought when I woke up was, Is there a snow day?â€™ But nothing was canceled. Thatâ€™s so New York; so New York Fashion Week,â€ said Girls starlet Allison Williams, perched front row, as was Stephanie Seymour, with her Brant boys in tow. And if it was a show they came for, a show they got. Wu sent out a legion of mods in elegant day frocks, nighttime dress-coats, and pleated skirts in a color palette anchored in black, grey, red, and bone. Of particular note: a pair of wool stovepipe pants balanced with a belted peplum top that’s quickly becoming a key trend for Fall ’13.